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comparison: src/ucx/cx/array_list.h

src/ucx/cx/array_list.h

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1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28 /**
29 * \file array_list.h
30 * \brief Array list implementation.
31 * \details Also provides several low-level functions for custom array list implementations.
32 * \author Mike Becker
33 * \author Olaf Wintermann
34 * \version 3.0
35 * \copyright 2-Clause BSD License
36 */
37
38
39 #ifndef UCX_ARRAY_LIST_H
40 #define UCX_ARRAY_LIST_H
41
42 #include "list.h"
43
44 #ifdef __cplusplus
45 extern "C" {
46 #endif
47
48 /**
49 * Defines a reallocation mechanism for arrays.
50 */
51 struct cx_array_reallocator_s {
52 /**
53 * Re-allocates space for the given array.
54 *
55 * Implementations are not required to free the original array.
56 * This allows re-allocation of static memory by allocating heap memory
57 * and copying the array contents. The information in \p data can keep
58 * track of the state of the memory or other additional allocator info.
59 *
60 * @param array the array to reallocate
61 * @param capacity the new capacity (number of elements)
62 * @param elem_size the size of each element
63 * @param alloc a reference to this allocator
64 * @return a pointer to the reallocated memory or \c NULL on failure
65 */
66 void *(*realloc)(
67 void *array,
68 size_t capacity,
69 size_t elem_size,
70 struct cx_array_reallocator_s *alloc
71 );
72
73 /**
74 * Custom data pointer.
75 */
76 void *ptr1;
77 /**
78 * Custom data pointer.
79 */
80 void *ptr2;
81 /**
82 * Custom data integer.
83 */
84 size_t int1;
85 /**
86 * Custom data integer.
87 */
88 size_t int2;
89 };
90
91 /**
92 * Return codes for cx_array_copy().
93 */
94 enum cx_array_copy_result {
95 CX_ARRAY_COPY_SUCCESS,
96 CX_ARRAY_COPY_REALLOC_NOT_SUPPORTED,
97 CX_ARRAY_COPY_REALLOC_FAILED,
98 };
99
100 /**
101 * Copies elements from one array to another.
102 *
103 * The elements are copied to the \p target array at the specified \p index,
104 * overwriting possible elements. The index must be in range of the current
105 * array \p size. If the number of elements added would extend the array's size,
106 * and \p capacity is not \c NULL, the remaining capacity is used.
107 *
108 * If the capacity is insufficient to hold the new data, a reallocation
109 * attempt is made, unless the allocator is set to \c NULL, in which case
110 * this function ultimately returns a failure.
111 *
112 * @param target the target array
113 * @param size a pointer to the size of the target array
114 * @param capacity a pointer to the target array's capacity -
115 * \c NULL if only the size shall be used to bound the array
116 * @param index the index where the copied elements shall be placed
117 * @param src the source array
118 * @param elem_size the size of one element
119 * @param elem_count the number of elements to copy
120 * @param reallocator the array re-allocator to use, or \c NULL
121 * if re-allocation shall not happen
122 * @return zero on success, non-zero error code on failure
123 */
124 enum cx_array_copy_result cx_array_copy(
125 void **target,
126 size_t *size,
127 size_t *capacity,
128 size_t index,
129 void const *src,
130 size_t elem_size,
131 size_t elem_count,
132 struct cx_array_reallocator_s *reallocator
133 ) __attribute__((__nonnull__(1, 2, 5)));
134
135 /**
136 * Allocates an array list for storing elements with \p item_size bytes each.
137 *
138 * @param allocator the allocator for allocating the list memory
139 * @param comparator the comparator for the elements
140 * @param item_size the size of each element in bytes
141 * @param initial_capacity the initial number of elements the array can store
142 * @return the created list
143 */
144 CxList *cxArrayListCreate(
145 CxAllocator const *allocator,
146 CxListComparator comparator,
147 size_t item_size,
148 size_t initial_capacity
149 ) __attribute__((__nonnull__));
150
151
152 #ifdef __cplusplus
153 } /* extern "C" */
154 #endif
155
156 #endif /* UCX_ARRAY_LIST_H */

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